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How Much Can $^{56}$Ni Be Synthesized by Magnetar Model for Long Gamma-ray Bursts and Hypernovae?
- Publication Year :
- 2014
-
Abstract
- A rapidly rotating neutron star with strong magnetic fields, called magnetar, is a possible candidate for the central engine of long gamma-ray bursts and hypernovae (HNe). We solve the evolution of a shock wave driven by the wind from magnetar and evaluate the temperature evolution, by which we estimate the amount of $^{56}$Ni that produces a bright emission of HNe. We obtain a constraint on the magnetar parameters, namely the poloidal magnetic field strength ($B_p$) and initial angular velocity ($\Omega_i$), for synthesizing enough $^{56}$Ni mass to explain HNe ($M_{^{56}\mathrm{Ni}}\gtrsim 0.2M_\odot$), i.e. $(B_p/10^{16}~\mathrm{G})^{1/2}(\Omega_i/10^4~\mathrm{rad~s}^{-1})\gtrsim 0.7$.<br />Comment: 6 pages, 4 figures; accepted for publication in MNRAS
- Subjects :
- High Energy Astrophysical Phenomena (astro-ph.HE)
Shock wave
Physics
Astrophysics::High Energy Astrophysical Phenomena
FOS: Physical sciences
Astronomy
Astronomy and Astrophysics
Astrophysics
Magnetar
Neutron star
Supernova
Stars
Astrophysics - Solar and Stellar Astrophysics
Space and Planetary Science
Astrophysics::Solar and Stellar Astrophysics
Neutron
Hypernova
Gamma-ray burst
Astrophysics - High Energy Astrophysical Phenomena
Solar and Stellar Astrophysics (astro-ph.SR)
Astrophysics::Galaxy Astrophysics
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....5d60f773aee1506debe79d7690449b7f